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ATXP032

DS-ATXP032–114I–4-2020

Figure 12-18. Active Status Interrupt in Octal Mode — DDR

13.

Other Commands and Functions

13.1

Read Manufacturer and Device ID (9Fh)

Identification information can be read from the device to enable systems to electronically query and identify the

device while it is in the system. The identification method and the command comply with the JEDEC standard for

“manufacturer and device ID read methodology for SPI-compatible serial interface memory devices”. The type of

information that can be read from the device includes the JEDEC-defined manufacturer ID, the vendor-specific

device ID, and the vendor-specific extended device information.

The Read Manufacturer and Device ID command is limited to a maximum clock frequency of f

CLK. Since not all

Flash devices are capable of operating at very high clock frequencies, applications should be designed to read the

identification information from the devices at a reasonably low clock frequency to ensure all devices used in the

application can be identified properly. Once the identification process is complete, the application can increase the

clock frequency to accommodate specific Flash devices that are capable of operating at the higher clock

frequencies.

To read the identification information, the CS pin must first be asserted and then the command of 9Fh must be

clocked into the device. After the command has been clocked in, the device begins outputting the identification

data on the SO pin during the subsequent clock cycles. The first seven bytes output are continuation codes (7Fh)

followed by the manufacturer ID and two bytes of device ID information. The eleventh byte output is the extended

device information string length, which is 01h, indicating that one byte of extended device information follows. After

the extended device information byte 1 is output, the SO pin enters the high-impedance state; therefore, additional

4 Dummy Cycles

RDY/BSY

MSB

Opcode

I/O0

(SI)

SCK

I/O1

(SO)

I/O2

(WP)

I/O3

I/O4

I/O5

I/O6

I/O7

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